Coefficient of variation (CV) of the objective parameters inferred by actigraphy
| Objective parameters | CV (95% CI) | |
| 1 | Mean activity score, min* | 2 (2 to 2) |
| 2 | Sleep efficiency, % | 7 (6 to 8) |
| 3 | Time asleep, min* | 10 (7 to 14) |
| 4 | Actual sleep, %* | 11 (10 to 12) |
| 5 | Moving time, %* | 34 (31 to 37) |
| 6 | Wake variance, min* | 41 (39 to 42) |
| 7 | Time awake, min | 41 (26 to 56) |
| 8 | Sleep onset variance, min* | 45 (35 to 55) |
| 9 | Wake episodes, n | 58 (51 to 64) |
| 10 | Total wake episode duration, min | 74 (66 to 82) |
| 11 | Sleep latency, min | 83 (75 to 90) |
| 12 | Variance from mean bed time, min* | 679 (157 to 1200) |
*This variable was used in just one study.